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Prevalence of Smoking before Pregnancy, during Pregnancy, and after Delivery,* by Year —Pregnancy Risk Assessment Monitoring System, United States, 10 sites,† 2000–2010

Notes: * = Smoking before pregnancy was defined as smoking 3 months before pregnancy on the basis of the PRAMS survey. Smoking during pregnancy was defined as smoking during the last 3 months of pregnancy on the basis of the PRAMS survey. Smoking after delivery was defined as smoking approximately 4 months after delivery on the basis of the PRAMS survey; † = Data aggregated for 10 PRAMS sites (Alaska, Arkansas, Colorado, Hawaii, Maine, Nebraska, Oklahoma, Utah, Washington, and West Virginia) with data available for all years; § = Significant linear trend (p≤0.05).